This is my rendition of a coloured clay mod that allows you to bake clay into hardened blocks and use default dye's to colour them... I've also added some extra dye recipe's to make colouring easier and a few new plants that can be made into dye also... To colour place 8x baked clay (any colour) and a dye in the centre.

WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_brick -> nether:stair_brick
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_brick -> nether:slab_brick
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_white -> bakedclay:stair_white
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_white -> bakedclay:slab_white
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_grey -> bakedclay:stair_grey
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_grey -> bakedclay:slab_grey
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_black -> bakedclay:stair_black
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_black -> bakedclay:slab_black
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_red -> bakedclay:stair_red
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_red -> bakedclay:slab_red
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_yellow -> bakedclay:stair_yellow
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_yellow -> bakedclay:slab_yellow
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_green -> bakedclay:stair_green
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_green -> bakedclay:slab_green
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_cyan -> bakedclay:stair_cyan
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_cyan -> bakedclay:slab_cyan
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_blue -> bakedclay:stair_blue
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_blue -> bakedclay:slab_blue
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_magenta -> bakedclay:stair_magenta
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_magenta -> bakedclay:slab_magenta
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_orange -> bakedclay:stair_orange
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_orange -> bakedclay:slab_orange
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_violet -> bakedclay:stair_violet
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_violet -> bakedclay:slab_violet
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_brown -> bakedclay:stair_brown
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_brown -> bakedclay:slab_brown
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_pink -> bakedclay:stair_pink
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_pink -> bakedclay:slab_pink
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_dark_grey -> bakedclay:stair_dark_grey
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_dark_grey -> bakedclay:slab_dark_grey
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:stair_dark_green -> bakedclay:stair_dark_green
WARNING[Main]: Not registering alias, item with same name is already defined: stairs:slab_dark_green -> bakedclay:slab_dark_green

Baked Clay registers each colour stair as bakedclay_red_slab or bakedclay_orange_stair so none of the above errors are coming from the mod unless it's something to do with stairs plus mod ??? I could remove stairsplus support and leave it to the mod to make it's own stairs since it registered every solid node into stairs.